The Seiko 1E20-5A10 is a watch model based on the 1E20 movement.
Parts List
| ET3N17SN01 | crystal |
| 32M59NS1 | crown |
| 0G1400B01 | case back gasket |
| 0G1450B01 | case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| TT20A | band - metal band |
| 04L05DSH | others - hour hand |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 1E200B20XS19 | others - dial |
| 1E205A104C | others - case |
| 82811630 | others - case ring |
| 04V05DSM | others - minute hand |
| 0354930 | others - winding stem |
| 05L19JSH | others - hour hand |
| 05V11JSM | others - minute hand |
Caliber 1E20
